Apply automated fixits for Chrome clang plugin to base_unittests.

base/process/kill_win.cc

Index: base/process/kill_win.cc
diff --git a/base/process/kill_win.cc b/base/process/kill_win.cc
index aa70f7c070e3aa2875564a007e166680fee0ad57..0da3a26ae4f78e9af924609904e81db7872958e2 100644
--- a/base/process/kill_win.cc
+++ b/base/process/kill_win.cc
@@ -38,12 +38,12 @@ static const int kWaitInterval = 2000;
 class TimerExpiredTask : public win::ObjectWatcher::Delegate {
  public:
   explicit TimerExpiredTask(Process process);
-  ~TimerExpiredTask();
+  ~TimerExpiredTask() override;
 
   void TimedOut();
 
   // MessageLoop::Watcher -----------------------------------------------------
-  virtual void OnObjectSignaled(HANDLE object);
+  void OnObjectSignaled(HANDLE object) override;
 
  private:
   void KillProcess();